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diff --git a/src/Text/Pandoc/Logging.hs b/src/Text/Pandoc/Logging.hs
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+{-# LANGUAGE DeriveDataTypeable, DeriveGeneric #-}
+{-
+Copyright (C) 2016-17 John MacFarlane <jgm@berkeley.edu>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+-}
+{- |
+   Module      : Text.Pandoc.Logging
+   Copyright   : Copyright (C) 2006-2016 John MacFarlane
+   License     : GNU GPL, version 2 or above
+
+   Maintainer  : John MacFarlane <jgm@berkeley.edu>
+   Stability   : alpha
+   Portability : portable
+
+This module provides data types and functions for warnings
+and info messages.
+
+-}
+module Text.Pandoc.Logging (
+    Verbosity(..)
+  , LogMessage(..)
+  , messageVerbosity
+  ) where
+
+import Text.Parsec.Pos
+import Data.Data (Data)
+import Data.Generics (Typeable)
+import GHC.Generics (Generic)
+
+-- | Verbosity level.
+data Verbosity = ERROR | WARNING | INFO | DEBUG
+     deriving (Show, Read, Eq, Data, Enum, Ord, Bounded, Typeable, Generic)
+
+data LogMessage =
+    SkippedInput String SourcePos
+  | NotRendered String
+  | YamlSectionNotAnObject SourcePos
+  | DuplicateLinkReference String SourcePos
+  | DuplicateNoteReference String SourcePos
+  | ParsingUnescaped String SourcePos
+  | DocxCommentWillNotRetainFormatting String
+  | CouldNotFetchResource String String
+  | CouldNotDetermineImageSize String
+  | CouldNotDetermineMimeType String
+  | CouldNotConvertTeXMath String
+  deriving (Show, Eq, Data, Ord, Typeable, Generic)
+
+messageVerbosity:: LogMessage -> Verbosity
+messageVerbosity msg =
+  case msg of
+       SkippedInput{} -> INFO
+       NotRendered{} -> INFO
+       YamlSectionNotAnObject{} -> WARNING
+       DuplicateLinkReference{} -> WARNING
+       DuplicateNoteReference{} -> WARNING
+       ParsingUnescaped{} -> INFO
+       DocxCommentWillNotRetainFormatting{} -> INFO
+       CouldNotFetchResource{} -> WARNING
+       CouldNotDetermineImageSize{} -> WARNING
+       CouldNotDetermineMimeType{} -> WARNING
+       CouldNotConvertTeXMath{} -> WARNING
+
+